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If you are unable to access your device home screen, and forgot previous gmail id to bypass google verification, so you can Bypass FRP Galaxy S6 Edge, S6 Edge+ and galaxy S6 using Odin software and combinational ROM.
For doing so you have to visit the link given below it explains you the steps in an understandable format with pictures.
http://www.techeligible.com/2018/03/15/bypass-frp-galaxy-s6-edge/